GLEN ROCK, N.J. (CBSNewYork) — Some teenagers and even pre-teens in New Jersey have been finding unsolicited pornographic pictures appearing on their cell phones, only because they use a certain photo app.

As CBS 2’s Derricke Dennis reported Wednesday, kids in Glen Rock have been receiving the decidedly adult-oriented photos through the app Snapchat.

“Pretty much everyone I knew who has an iPhone got it, and when I told them about it, they said they had the same problem,” said James Hector, 18.

The smart phone pics spread fast at Glen Rock High School and Glen Rock Middle School on Tuesday. The senders had suggestive usernames, and asked the receivers to add them as friends.

Pictures on Snapchat automatically delete seconds after they are opened. But at least one student saved one, and remembered the screen name.

“I think it was ‘Sexy Cherry,’” said Justin Padilla, 17, “and it was a naked girl.”